HTML，html教程
<html><head><title>postion方式的置中</title><style>div{width: 200px ;height: 200px ;background: red ;position: absolute ;left: 50% ;top: 50% ;margin-top: -100px ;margin-left: -100px ;}</style></head><body><div></div></body></html>
以上是使用postion的方式來使得DIV上下左右一直在中間，DIV的大小不會變。
<html><head><title>margin方式的置中</title><style>body{margin: 0px;padding: 200px;}div{width: 100% ;height: 100% ;background: red ;}</style></head><body><div></div></body></html>
以上是使用margin的方式是的DIV置中，他的形狀取決於什麼，希望大家自己仔細看看。
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